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Replacement procedure for Compressor(ARUN508T2-ARUN4808T2) Replacement procedure for Compressor(ARUN50LT2 - ARUN480LT2) 1) Collect the refrigerant by using refrigerant recovery unit (Since the setting on outdoor unit PCB is required for refrigerant recovery, refer to the warming plate Precautions in service work attached on the switch box cover) 2) Remove the sound insulator mat covering the faulty compressor, and disconnect the power 3) Disconnect the brazing sections of suction pipe and discharge pipe by using brazing torch after the refrigerant has been collected completely. 4) Remove equalizing pipe nut. 5) Remove three bolts at cushion rubber section to take out the faulty compressor outside the unit. 6) Install the new compressor in the unit.(Be sure to insert the cushion rubbers before tightening the fixing bolts of compressor.) 7) Remove the rubber caps put on the suction and discharge pipe of the new compressor to release.the sealing nitrogen gas.(Take note that oil may spout due to the pipe inside pressure if the plug put on the equalizing seat is removed before removing of rubber cap.) 8) Fasten equalizing pipe with nut.(14 ~ 18N.m) 9) Braze the suction and discharge pipe with brazing torch to the compressor. Cut section 10) Conduct air tight test to check the piping system is free from leakage. 11) Connect power cable to the terminal board of compressor and cover the compressor with sound insulator mat. 12) Conduct vacuum drying.(Since the setting on outdoor unit PCB is required for vacuum drying, refer to the warning plate recautions in service work” attached on the switch box cover.) 13) Charge refrigerant after the completion of vacuum drying, and check the function of compressor with cooling or heating operation. Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes - 58 - Discharge pipe Suction pipe Oil Return pipe Equalizing seat outlet LGE Internal Use Only
Part 4 Trouble shooting guide Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes - 59 - LGE Internal Use Only
Page 1 and 2:
System Outdoor Unit R410A SERVICE M
Page 3 and 4:
Safety Precautions Copyright ©2007
Page 5 and 6:
Ventilate before operating air cond
Page 7 and 8: Use power cables of sufficient curr
Page 9 and 10: Safely dispose of the packing mater
Page 11 and 12: 1. Model Names 1.1 Indoor Unit * AR
Page 13 and 14: 2.2 Outdoor Units 2.2.1 Cooling Onl
Page 15 and 16: 3. Combination of Outdoor Units 3.1
Page 17 and 18: 4. Nomenclature 4.1 Indoor Unit ARN
Page 19 and 20: Part 2 Outdoor Units Copyright ©20
Page 21 and 22: Function Copyright ©2007 LG Electr
Page 23 and 24: 1.3 Master and slave Unit's EEV con
Page 25 and 26: 2.1.2 Oil return control on heating
Page 27 and 28: 2.3 Stopping operation 2.3.1 Stoppi
Page 29 and 30: 3.2 Discharge temperature control
Page 31 and 32: 4. Other control 4.1 Initial setup
Page 33 and 34: 4.2 Emergency operation - If a comp
Page 35 and 36: ■ Sensor Check Error Code Display
Page 37 and 38: Liquid Pipe Gas Pipe Procedure 1. A
Page 39 and 40: CAUTION 1. Guaranteed Temperature r
Page 41 and 42: 4.7 Pump Out This function gathers
Page 43 and 44: 4.8 Auto Back Up Function_Inverter
Page 45 and 46: 4.10 Night Low Noise Function In co
Page 47 and 48: 4.11 Vacuum Mode This function is u
Page 49 and 50: Part 3 PCB Setting and Test Run Cop
Page 51 and 52: 2. How to cope with Test Run abnorm
Page 53 and 54: ■ Checking according to dip switc
Page 55 and 56: Function Dry Contact Snow Forced De
Page 57: Replacement procedure for Compresso
Page 61 and 62: Copyright ©2007 LG Electronics. In
Page 63 and 64: 2.2 Fan Motor Checking Item Symptom
Page 65 and 66: • EEV Coil and body(Outdoor unit)
Page 67 and 68: 2.4 Phase Bridge Diode Checking Met
Page 69 and 70: 2.6 Fan IPM Checking Method 2.7 UW1
Page 71 and 72: 2.10 Other Copyright ©2007 LG Elec
Page 73 and 74: Outdoor unit related error Display
Page 77 and 78: Outdoor unit related error Copyrigh
Page 79 and 80: Outdoor unit related error Copyrigh
Page 83 and 84: Error No. 01 Indoor unit air sensor
Page 86 and 87: Troubleshooting Guide float A:Point
Page 88 and 89: Troubleshooting Guide Error No. 06
Page 90 and 91: Troubleshooting Guide Error No. 10
Page 92 and 93: Troubleshooting Guide Error No. 21*
Page 100 and 101: Troubleshooting Guide * Measuring r
Page 108 and 109:
Troubleshooting Guide Error No. Err
Page 110:
Page 113 and 114:
Error No. 52* Master 521 Slave1 522
Page 115 and 116:
Error No. Error Type Error Point Ma
Page 117 and 118:
Page 119:
Page 122 and 123:
Troubleshooting Guide Measuring inp
Page 124 and 125:
Page 126 and 127:
Page 128 and 129:
Page 130 and 131:
Page 132 and 133:
Page 134 and 135:
Page 136 and 137:
Troubleshooting Guide Error No. 151
Page 138 and 139:
Page 140:
P/NO : 3828A24006W OCT, 2007
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